Stop mechanism operating means



n- 1945- R. A. COLLINS STOP MECHANISM OPERATING MEANS 2 Sheets-Sheet 1 Filed July 10, 1945 Jan. 16, 1945. R. A. COLLINS STOP MECHANISM OPERATING MEANS 2 Sheets-Sheet 2 Filed July 10, 1943 Patented Jan. 16, 1945 I PATENT, OFFfICL-E I i Y 7 2,367,187 O QHANISM OPERATINGMEA i A? f lii siwhite PIdiIaSJ N'JYJagsififji Aiiplicatiohlluly lfi, 1943, 'Seiial No. 494,166

"'11 Claims; 01 11247) Thisi'riifer'iti om riates t'o s'tofa ineci anisiii con-'- aiemng means for aiitomatic maehi ies w s'e princi sieiifwperation issuch t at,- when mafimechanism to stopping position is permitte"E1.

While'riotlimitedfthi'eto, the inventien is of pai ticuIar ii tility in cenneciioii with bi'it'torihole own as "s'traig li't mor amahifi's', described; fio'rj eiianipleg in pet: 14,284, Ndir'eifilfv'er 25 i902, emetic. es

to the stopfiiiig (if the clamp is usually aiitomatically closed to' eiam the work when the machine is started. and automatically opened to release the I work when the machine" is stopped. In a straight hole machine, as describeq in the 'pateiits "above;

refer l e'dtm tlie stitch-positioning feedirig' m ve niehts are imparted to the work clamp, first in one-direction from "astarting 'p'ds'itiori and their in the opposite direction back tothe starting p0"- sition; the stop mechanism comprises "a; stop' armwhich is manually inovedgfas" by a treadleer handiever, out of a stoppinglp'o'si ',*irito*whi'ch i tziswnmnaily 'bia'sefl-and in which the machine" i-s alt r'e'st; i n'to afiiilfini ng' position, 'iII which the machine is operated under 'no'wfl means are provided 'for lalthifi'g th Sfi O'p g position, said latching' mean'sbeing' automatically released, when the Work cl'aiiip is 'retu 'd'to its starting positiongtdpermit the stop arm to re--' turn to istppihgposition; and the bilfitbfi'hol "rticill arly 176 ills't iirior'to the actual stopping" of the machine. Iri such a-machine-the stop arm mflst be inoved at leastfc'ompleteiy out of stopping position befer it eanbe latched in running position, 'and;

for-practical reasons, some slight cle'arance'ort leeway musthe'proiiided, thatis to say, there ihiistbeisenie seating, however smalhbetweenthe stopbin'g and running positions. With'such an arrangement it is possible for a careless operator; by a'r'iim ieifect'oi incomplete operationof the tfeadle' or hand lever, toproduce what is-kr ovm a, false start; that is to say, it is possilble te iiiove thestop arm just farenou'g'hto permit the-machine to start Without latching it in runningpo'sitioiii When this occurs, if the operator releases the'tre'a'dle or lever after s'tartingthe fiiachii-ie =(Which; in the normaPoperatidn; must be d 'e in order to fper-r-nit thesiibs'quent auto me. tom-mg e'fithe machine); the "stop arm will retu rii atonc'e'to stoppii-ig' position, sothat;

after the formation of. a relatively few stitches} the machine will bestopped, the button'hoie 'c'iitter-operate'd, and the work clamp opened, Ieavmg a cut biit incompletely stitched 'butt'onldole' which iiiiist beiestitche'd. This is 'difii'cult, be-

exactly the position in which itwas. 6ub,-2fid is apt to result in imperfect Work, because crt'aiin number of; stitches will be; superi mpo'sed, and;

more important', because machines of this type, heirigd'esi'g ned to stitch before cutting, cannot-be relied u'pon'to produce :pe-rfect work cut buttonhole. t

In accordance with the'present invention, the foregoing difficiilties are overcome by the provibe" obvious to thoseskiiled 'in the art that safe inventiomra's"defiried tythe claims hereuntoappezided, may be otherwiseembodied Wi'tl ioiitdpartttre'froffi "the spirit and scope thereof.

*In saidsd rawin'gsz Fig.- '1 a sideieievaitionypartiy vertical sectiOiI- and apaftly brokef away, of a machifie 'iijav- In the drawings (see particularly Figs. 1 and 3)' is shown a portion of a traight-hole buttonhole sewing machine of the general type described in the patents a'bove referred to. Said machine comprises a hollow base A having at its top a bed l5 from which rises a standard it carrying an overhanging arm |1 spaced above the bed. Guided on the bed for longitudinal movement thereon is a work clamp comprising a clamp plate Is to which is pivoted at I9 alever 29 carrying clamp arms 2| to the extremities of which are [pivoted clamping feet 22. The clamp arms 2|, except when restrained as hereinafter described and as shown in Fig. l, are normally depressed, to close the clamp and cause the feet 22 to clamp the work upon the plate l8, by a spring 23 interposed between the lever 28 and the plate l8. The clamp plate |8 is connected by a ball and socket connection, generally indicated at 24, with a nut 25 threaded on a feed screw 26 which is intermittently rotated by mechanism not shown, first in one direction and then in the other, to cause the nut 25, and consequently the work clamp as a whole, to be moved, from a starting position shown in Figs. 1 and 3, first toward the left, as viewed in said figures, to position the stitches along one side of the buttonhole, and then toward the right back to the starting position to position the stitches along the opposite side of the buttonhole.

The stitch forming or sewing instrumentalities comprise an eye-pointed needle 21 above the bed and cooperating underthread handling mechanism not shown, below the bed. The needle 21 is carried by a needle bar 28, which is longitudinally or vertically reciprocated, by means generally indicated at 29, in a needle bar guide 38, means,

not shown, being provided for oscillating said guide alternately in opposite directions transversely to the direction of feed of the work clamp between successive strokes of the needle toposition the depth stitches.

A main shaft 40 journalled in bearings, in the bed |5 has power applied thereto by a belt 4| alternatively engageable with fast and loose pulleys 42 and 43 on said shaft under the control of a belt shifter 44. The belt shifter 44 constitutes an extension of a stop member or arm 45 carried by an oscillating and longitudinally movable rock shaft 46 mounted for oscillation and a limited longitudinal movement in bearing lugs 41 and 48 depending from the bed. The shaft 46 is normally biased or urged toward the right, as viewed in Figs. 1 and 3, to engage the belt 4| with the loose pulley 43, by a spring 49 surrounding said shaft and interposed between the bearing lug 48 and a collar 58 secured to the shaft, engagement of said collar with the bearing lug 41 limiting the movements of said shaft under the influence of said spring. The collar 50 is provided with a laterally extending arm 54 by whichthe shaft 46 may be moved to the left against the tension of the spring 49 by means hereinafter described.

Slidably mounted in the stop arm 45 is a spring pressed stop bolt 5|, the end of which, when the shaft is in the longitudinal position shown in Figs. 1 and 3 (i. e., the stopping position in which the belt 4| is engaged with the loose pulley 43) is in the path of a cam 52 (see also Fig. 4) fast on the shaft 40, said cam having a rising portion b; a notch c and a stop shoulder d. The bolt 5|, when in the path of movement of the cam 52, is held in engagement with the periphery of the latter by a spring pressed plunger 53 carried by the upright IG-andengaging the stop arm 45, said plunger tending to force said stop arm downwardly and press the end of the bolt 5| against the periphery of the cam 52.

A buttonhole cutter is carried by a lever 6| journalled on a short stud shaft 62 supported in the bed, said lever having an arm 63 connected by a universal joint, generally indicated at 64 (Fig. 3) with a stud 65 extending inwardly from the stop arm 45. The arrangement is such that when the end of the stop bolt 5| rides upon the rising portion b of the cam 52, the buttonhole cutter 6| is depressed to cut the buttonhole slit, after which, when the end of the bolt enters the notch c the spring pressed plunger 53 causes the buttonhole cutter to rise to its original position, and when the end of the bolt 5| is engaged by the stop shoulder d the machine is positively stopped, the stopping impact being cushioned by the yielding of said bolt.

Except as hereafter pointed out, the construction, arrangement and mode of operation of the parts above referred to are, or may be, substantially as more fully described in the above mentioned patents, particularly Patent No. 714,284.

Pivoted at 10 in the wall of the upright I6 is a lever having one arm 12 extending into the upright into a position to engage an extended portion 13 of the lever 20 which carries the clamp arms 2|. When the clamp closes under the influence of the spring 23, the arm 12 is moved upwardly, while downward movement of said arm will cause the clamp to be opened to realease the work against the tension of said spring. Pivoted at 14 to the arm 12 is a depending link. 15 carrying a catch or block 16. The link 15 is normally urged by a spring 19 in the direction to cause the catch or block 16 to engage a lug 80 carried by the arm 63 of the buttonhole cutter lever 6|. Consequently, when the buttonhole cutter 60 rises, the arm 12 is drawn downwardly to open the work clamp.

Journalled in ears B6 in the base A is a rock shaft 81 having secured'thereto, as by a set screw 95, a three-armed lever indicated as awhole at 88. One arm 89 of the lever 88 has connected therewith a spring 98 tending normally to turn the shaft 81 in a clockwise direction as viewed in Fig. 1. A second arm 9| of the lever 88 is connected; as hereinafter described, with a foot treadle 93, whereby depression of the treadle will turn the shaft 81 in' a counter-clockwise direction against the tension of the spring 90. The third arm 94 of the lever 88 is extended into a position to engage the arm 54 when the shaft 81 is turned in the counter-clockwise direction, thereby sliding the shaft 46 toward the left in Figs. 1 and 3, out of stopping position, to start the machine as above explained. Also fast on the shaft 81 is a trip finger 96 adapted, when the shaft 81 is turned in a counter-clockwise direction, to engage the catch or block 16 and disengage the latter from the lug 80. The arrangement is such that when the treadle 93 is depressed to turn the shaft 81 assess? in a eounter clo'ckwise directionfi emen-normal position "as "s own Fig. Ijih which it 48 116111 -by the springst, the' tripfinger 95M11 engage the catch is to sisengage tne latter from-the block at;

"Mounted, as' by ascrew I'll'i'on 'the bearing lug la, is a r ctaryiatch iM-nerma11y urged in a cloekwise 'diiedthm eas'wewed -in" F-ig1- '3 by a spring I02. The latch IOI has an upstanding finger m3 (see ails'o' -Fig. '1') whihcdoperates'with a collar I-II4- on the-shaft 46. The arrangement is sue-ninet- When the shaft W6 is moved toward thele'ft'froih the p es iori''s'i'i'owh *iriiligs; land '3 fu-Iirunning e's on, the finger its is; caused by the -spfing Hi2 to snap back of "the shoulder W5 provided by the collar I I M to hold "the shaft lit m'ru'n'ning position. .Q

'Afioatingang'ular harm) (Figs. 3 and 5') has one end'receivedin an-dpning III'in'the wall erthe bed 1 5 in suc -a manner-gs to permit both longitudinal e d-angniai movement or said her in a horizeht'ar direction. The -har'- H "is: formed with a"lat rally-extending(flange orear' 1 1'2 which ,is-gui'ded in h -horizontal 'g'rdove 11-3 ,in the lateml racedr aboss is depending from the bed I5, wherebythe barI-I Oisguiddfor lateral horizontal angiilar "or swinging, movernent about its connection atI- II with the bed. "I'he'bar III) isnoriiially urged -'toward'the left, as Viewed in Fig. '3,- b'y a-spririg"'3'l's'eated inanextension'of the groove I-I-3,'the normalposition of'said bar under the influence oi'said-spring being shown in Fig'. 3. dog -'I i8,=ca'rried byt-heend of the bar, is laterally ofise't from the finger I03, as shown inFig. 3. When the'bar III] is-s'wung to the rightagainst the tensidnoftheispring; 3I,the end of thedog H8 is brought o positethe-finger' m3 The bar II-U 'is-fcir'med with an angular 'po'rtion I22 (see particularly Fig. 5 which is held by a springl 23 in en agement with the'periphery of a cam "I24 on the main shaft 40, whereby at eachrdtation of said shaft, that is to --say, during eachstitch forining cycle of the machine, said bar is, given a 'iongitudinal movement," said movement "being guided Joy-the opening I-*II"and's1ot"II3. When said bar is in the me al osition shown in Fig. 3,-

this' 'inovemeiit is an idle one, but when said bar isswung to theright 'fromthis'posihon, there: bybringing the-dog II'8 opposite the finger I03, such a longitudinal movement wili Ga-use said dog tn engage'said finger and release the latter from tIieshouIder-I QS. p H

Pivote'd at I30 (Fi'g."1) to the underside of the reed nut 25 1s a dog lslnormany held by a spring I32 with its right hand end (asviewed iii-Fig.1) elevated or in such positiont at, 'whenthe nut 25 is moved to the rightinto its'initial or: start} ing position upon the completion ofth'. buttonliole, said end will engagethef bar I I II and swing the latter toward "the right from the position.

shown in Fig. 3 into a position to bring the dog 'IIB opposite the finger I03, The-dog I3I is formed with a laterally offset cam projection I3 3 adapted to be engag'd'b'y a cooperating cam projection I 34' on an arm I3 5 extending from the 'collar'5fl. I when theshaft ifi rnoves toward the right. (as viewed in'FigsI l and 3) to stop the machine (the nut 25 being in the position shown in said figureslthe cam projection -I3 4-engages the cam protection I 33,, thereby depressing the freexend of the-dog=I3I into the-position shown in Fig. 1, causing the 'sarne'to disengage the=bar IIIL-and permitting the latter toswing into its normaLpo- The arrangement is such, that When in this-position; the end of a 16' from the lug '80, thereby permitting the'work clamp to close under the influence of its spring 23, and causes the arm 94 'to move theshaft -46 toward'the left-into runningposition, in which posit-ion it is r'etaine'db'y engagement of the finger I03 with the stop shoulder I 05 under the influeence of the spring I02. When theparts are in this position, the belt' iI is engaged with the fast pulley 4 2,- and theen'd of the stop bolt 51 is out of the path of the cam 52. As above stated, during the buttonhole sewing cycle the feed nut '25 is moved by the screw "26, first toward the left and then toward the right back to its initial or starting position shown in Figs. l and 3. Movemerit of the shaft 46'in't0 runningtposition has caused a corresponding movement of thecam lug I34 to the left'froin the position s-hown'in Figs. '1 and3. Consequently, whenthe feed nut 25, in its movement toward the right, approaches its initial-position, the cam lug I33 will have passed out of engagement with thecam lug It' l-before said initial positionis fully reached, permitting the-free end of the'dog I3I to rise, under-the influence of the spring l3-2 into such apositio'n ping position. The latter operations require that the tradle 93 shall have been released after starting the machine, or at least before the completion of the buttonhole cycle, and the shaft 81,

lever 88 and trip finger 96 restored to the position shown in-Fig. 1 under the influence of the spring '90. Movement of the "shaft '46 into stopping position shifts the belt 4| froin the fast grtorelease the link 15, so thatwhen the butto'nhole cutter is depressed "the catch I6 is reengaged with-the lug-8'0 by the spring T9,*and when the buttonhole cutter rises the work clamp is opened. "Movement of the shaft 46 intostopping position also restores the cam 'l'ug I34 to the position shown in Fig. 1, thereby depressing the-dog I3I-, releasing the'bar III], and'perr'nitting the spring 123 to restore "said bar to idling position; asshown in Figx3.

The automatic 'c'y'cle above outlined depends upon 'a sufficient counter-clockwise angular movement of the lever 88 to move the'shaft 4'6 far e'neu-ghtowardthe'left to be'latched i'nrunning position-by engagement'of the finger H13 with the shoulder I05 when the machine is started; ln-p'riormachin'es-of this type-in which the treadle 93 hasbeen e'on'necte'dwith the arm 9I bya simplelinkor chain, it has'been'possible for a careless operator, by reason of an incom piete de ression (if the-tr'ad'le, 1:0"11'10V'fll Shaft 46-alid 'stdparmliiar enough toehg'ag'e the on the frame.

belt H with the fast pulley 42 and disengage the end of the stop bolt 5I from the stop shoulder d (thereby starting the machine) without moving said shaft far enough to be latched in running position. If this occurs, when the treadle is released after starting (as, for reasons above stated, must always be done), the shaft 46 and stop arm 45 are immediately returned to stopping position under the influence of the spring 49, the buttonhole cutter operated, the work clamp opened, and the machine stopped, all without completing the sewing cycle. In accordance with the present invention, means are provided whereby, if the stop mechanism is moved far enough to start the machine at all, its movement into full running position (in which it is latched until automatically released only at the completion of the sewing cycle) is insured. As herein shown, such means are as follows.

The arm SI of the lever '88 is connected with the treadle 53 through a link I40 and a spring I4I. Associated and cooperating with the arm 9| is a resistor assembly adapted to interpose a substantial resistance to the movement of said arm (and consequently of the stop mechanism) to an extent sumcient to cause or permit the machine to start, and to suddenly discontinue the resistance when the arm has been moved to such an extent. This resistor assembly comprises (see particularly Fig. 2) an element I42 carried by the arm 9| and a cooperating element I43 The element M2 comprises a dog pivoted at I44 to a bracket I45 secured to the arm SI, said dog having a stop shoulder I46 adapted to engage a portion of said bracket and thereby limit movement of said dog on its pivot in a counter-clockwise direction (as viewed in. Fig. 2) in which direction it is urged by a spring M1. The element I43 comprises a block secured to the free upper end of a fiat spring I48 secured at its lower end to a bracket I49 which, in turn, is secured to the bottom wall of the base A. The elements I42 and I43 are formed respectively with opposed projections I55 and I5I having cooperating inclined cam faces I52 and I53 which are brought into engagement when the arm 9| is moved downwardly.

In operation, when the treadle 93 is depressed, initial downward movement of the arm 9I brings the cam surface I52 into engagement with the cam surface I53. Since the dog I42 is held against counter-clockwis movement about its pivot I44 by engagement of its stop shoulder I46 with the bracket I45, further downward movement of the arm BI is possible only by forcing the block I43 laterally, against the resistance of the spring I48, by the wedging or camming action of the surfaces I52 and I53, thereby imposing a considerable strain or tension upon the spring I4I. This all occurs before the end of the stop bolt 5I is completely withdrawn from the notch c and stop shoulder d of the cam 52, and therefore before the machine can start. As, or just before, the end of the stop bolt 5I leaves the notch c and stop shoulder d, the cam surface I52 passes out of engagement with the cam surface I53, so that the tension (previously applied as above explained) of the spring I4I causes the lever 88 and shaft 46 to be snapped into the full running position in which said shaft is retained by the latch IDI, the downward movement of the arm BI under the influence of the Spring I4I being checked by engagement thereof with an upturned stop projection I54 on the bottom wall of the base A. When the treadle 93 is subsequently released to permit the lever- 88 to return to its normal position under the influence of the spring 90, leaving the stop mechanism latched in running position, the arm 9| can move upwardly without interference by the resistor assembly since the dog I42 can turn in a clockwise direction to permit the projection I to pass the projection I5I during the upward movement.

From the foregoing it will be seen that if the treadle 93 is not depressed far enough to carry the camsurface I52 of the resistor element I42 beyond the cam surface I53 of the element I43, the stop bolt 5I will not be completely withdrawn from the notch c and stop shoulder d, and the machine will not start, so that if the treadle be released, the spring 49 will return the stop devices to full stopping position, and there will be no false start. If, however, the treadle is depressed far enough to withdraw the end of the stop bolt from the notch c and shoulder d, so as to permit the machine to start, the cam surface I52 will have passed out of engagement with the cam surface I53, and the tension which has been imparted to the spring MI by the coaction of the resistor elements during the initial depression of the treadle, will cause thestop devices to be snapped into the full running position in which they are retained by the latch IllI. Therefore, when the treadle is released, the stop devices will not be returned to stopping position until the completion of the full cycle of operations of the machine and the automatic release of the latch IIII, as above explained, and there will have been no false start.

It is obvious that in place of the treadle 93, a hand or knee operated lever might be employed, and the terms manually operated means, manually operated member and the like, as hereinafter used, are intended to include all such equivalent, foot, leg, hand, etc. operated devices.

I claim:

1. In a sewing machine or the like having a predetermined cycle of operations, stop mechanism movable into and out of stopping position, means for retaining said stop mechanism out of stopping position during said cycle of operations and for restoring the same to stopping position upon the completion of said cycle, manually operated means for moving said stop mechanism out of stopping position, and means for compelling movement of said stop mechanism into a position to be retained by said retaining means, when moved out of stopping position by said manually operated means, before permitting its return to stopping position.

2. In a. sewing machine or the like having a predetermined cycle of operations, stop mechanism movable between a stopping position and a running position and normally biased toward stopping position, manually operated means for moving said stop mechanism out of stopping position, a detent for retaining said stop mechanism in running position, means for automatically releasing said detent upon completion of the cycle of operations, and means associated with said manually operated means for insuring the movement of said stop mechanism into a position to be retained by said detent when moved out of stopping position.

3. In a sewing machine or the like having a predetermined cycle of operations, stop mechanism movable into and out of stopping position, means for moving said stop mechanism out of stopping position, a manually operated member, means including a spring connecting said manusaid lever, a dog carried by said lever arm, a

ally operated member and moving means, and means for interposing a'yielding resistance to the initial movement of said moving means and for discontinuing said resistance substantially upon the completion of the movement of said stop.

mechanism out of stopping position.

4. In a sewing machine or the like having a predetermined cycle of operations, stop mecha- I nism movable into andout of stopping position, means including a lever for moving said stop mechanism out of stopping position, a manually operated member, means including a spring connecting said manually operated member and lever, and means for interposing a yielding resistance to the initial movement of said lever and fOr discontinuing said resistance substantially upon the completion of the movement of said stop mechanism out of stoppingposition.

5. In a sewing machine or the like having a predetermined cycleof operations, stop mechanism movable into an'dout of stopping position, means for retaining said stop mechanism out of stopping position during said cycle of operations and for restoring the same to stopping position upon the completion of said cycle, means for moving said stop mechanism out of stopping position, amanually operated member, means including a spring connecting said manually operated member and moving means, and means for interposing a yielding resistance to the initial move-.

ment of said moving means and for discontinuing said resistance substantially upon the completion of the movement of said stop mechanism out of stopping position.

6. In a sewing machine or the like having a predetermined cycle of operations, stop mechanism movable into and out of stopping position, means including a lever for moving said stop mechanism out of stopping position, a manually operated member, means including a spring connecting said manually operated member with one arm of said lever, a dog carried by said lever arm, a block, and a spring for yieldingly resisting movement of said block transversely of the path of movement of said lever arm, said dog and block having cooperating cam surfaces brought into engagement upon initial movement of said arm in the direction to move said stop mechanism out of stopping position, whereby further movement of said arm is possible only by forcing said block laterally against the resistance of its spring, and said cam surfaces being so relatively arranged as to pass out of engagement with each other substantially upon the completion of the movement of said stop mechanism out of stopping position.

7. In a sewing machine or the like having a predetermined cycle of operations, stop mechanism movable into and out of stoppingposition and normally biased toward said position, a detent automatically released upon thecompletion of said cycle of operations for holding said stop mechanism out of stopping position, means including a lever for moving said stop mechanism out of stopping position, a manually operated member, means including a spring connecting block, and a spring for yieldingly resisting movement of said block transversely of the path of movement ofsaid lever arm, said dog and block having cooperating cam surfaces brought into engagement upon initial movement of said arm ii the direction to move said stop mechanism out of stopping position,.whereby further movement of said arm is possible only by forcing said block laterally against the resistance of its spring, and said cam surfaces being so relatively arranged as to pass out of engagement with each other substantially upon the completion of the movement of said stop mechanism out of stopping position 8. In a sewing machine or the like having a predetermined cycle of operations, stop mechanism movable into and out of stopping position, manually "operated means for moving said stop mechanism out of stopping position, and means for interposing a yielding resistance to the initial movement of said moving means and for discontin uing said-resistance substantially upon the completion of the movement of said stop mechanism out of stopping position.

9.. In a sewing machine or the like havinga predetermined cycle of operations, stop mechanism movable into and out of stopping \position, means for retaining said stop mechanism out of stopping position during said cycle of operations and for restoring the same to stopping position upon the completion of said cycle, manually op erated means for moving said stop mechanism out of stopping position, and means for interposinga yielding resistance to the initial, movement of said moving means and for discontinuing said resistance substantially upon the completion of the movement of said stop mechanism out of stopping position.

10. In a sewing machine or the'like having a predetermined cycle of operations, stop mechanism movable into spaced stopping and running positions, respectively, means for retaining said stop mechanism in running position during said cycle of operations and for restoring the same to stopping position upon completion of said cycle,

manually operated means for moving said stop mechanism out of stopping position, and means for compelling movement of said stop mechanism into running position when moved out of stopping position s-ufiiciently far to permit the machine tostart.

11. In a sewing machine or the like having a predetermined cycle of operations, stop mechanism movable into spaced stopping and running mechanism out of stopping position, and means,

associated at least in part with said manually operated means, for compelling movement of said stop mechanism into running position when moved out of stopping position sufiiciently far to permit the machine to start.

RALPH A. COLLINS. 

